WRF - Developmental Testbed Center

intermediate files if ungrib is to be run on multiple sources of GRIB data. Default value is'FILE'.D. METGRID sectionThis section defines variables used only by the metgrid program. Typically, the user willbe interested in the fg_name variable, and may need to modify other variables of thissection less frequently.1. FG_NAME : A list of character strings specifying the path and prefix of ungribbeddata files. The path may be relative or absolute, and the prefix should contain allcharacters of the filenames up to, but not including, the colon preceding the date. Whenmore than one fg_name is specified, and the same field is found in two or more inputsources, the data in the last encountered source will take priority over all precedingsources for that field. Default value is an empty list (i.e., no meteorological fields).2. CONSTANTS_NAME : A list of character strings specifying the path and fullfilename of ungribbed data files which are time-invariant. The path may be relative orabsolute, and the filename should be the complete filename; since the data are assumed tobe time-invariant, no date will be appended to the specified filename. Default value is anempty list (i.e., no constant fields).3. IO_FORM_METGRID : The WRF I/O API format that the output created by themetgrid program will be written in. Possible options are: 1 for binary; 2 for NetCDF; 3for GRIB1. When option 1 is given, output files will have a suffix of .int; when option 2is given, output files will have a suffix of .nc; when option 3 is given, output files willhave a suffix of .gr1. Default value is 2 (NetCDF).4. OPT_OUTPUT_FROM_METGRID_PATH : A character string giving the path, eitherrelative or absolute, to the location where output files from metgrid should be written to.The default value is the current working directory (i.e., the default value is './').5. OPT_METGRID_TBL_PATH : A character string giving the path, either relative orabsolute, to the METGRID.TBL file; the path should not contain the actual file name, asMETGRID.TBL is assumed, but should only give the path where this file is located.Default value is './metgrid/'.6. OPT_IGNORE_DOM_CENTER : A logical value, either .TRUE. or .FALSE.,specifying whether, for times other than the initial time, interpolation of meteorologicalfields to points on the interior of the simulation domain should be avoided in order todecrease the runtime of metgrid. This option currently has no effect. Default value is.FALSE..WRF-NMM V3: User’s Guide 3-37